title: Structural and optical properties of Cu-doped ZnS nanoparticles formed in chitosan/sodium alginate multilayer films.
abstract: Chitosan/alginate multilayers were fabricated using a spin-coating method, and ZnS:Cu nanoparticles were generated within the network of two natural polysaccharides, chitosan and sodium alginate. The synthesized nanoparticles were characterized using an X-ray diffractometer (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM). The results showed that cubic zinc blende-structured ZnS:Cu nanoparticles with an average crystal size of ~ 3 nm were uniformly distributed. UV-vis spectra indicate a large quantum size effect and the absorption edge for the ZnS:Cu nanoparticles slightly shifted to longer wavelengths with increasing Cu ion concentrations. The photoluminescence of the Cu-doped ZnS nanoparticles reached a maximum at a 1% doping level. The ZnS:Cu nanoparticles form and are distributed uniformly in the composite multilayer films with a surface average height of 25 nm.
authors.affiliation: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
authors.forename: Liping
authors.initials: L
authors.lastname: Wang
authors.forename: Yujie
authors.initials: Y
authors.lastname: Sun
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Xie
mesh_terms: D000464:Alginates / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D014961:X-Ray Diffraction; D019287:Zinc Sulfate / Q000737:chemistry*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D019287:Zinc Sulfate; D003300:Copper; D020723:Glucuronic Acid; D048271:Chitosan
keywords: ZnS:Cu; chitosan/alginate multilayer; films; nanoparticles